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Finding the Fourth Proportional to 764.63, 1,055.19 and 449.91

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Solution

The fourth proportional to 764.63, 1,055.19 and 449.91 is: 620.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.63 : 1,055.19 = 449.91 : x
  2. Step 2: Convert to fraction form
    764.63/1,055.19 = 449.91/x
  3. Step 3: Cross multiply
    764.63x = 1,055.19 × 449.91
  4. Step 4: Simplify right side
    764.63x = 474,736.58
  5. Step 5: Solve for x
    x = 474,736.58/764.63
  6. Step 6: Final answer
    x = 620.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.